Well i think they do,i mean not sleeping like "Boy am tired"
i mean like to get enegy back,so if Kopaka summens all of his enegy to
wipe out a hundred Bohrok then when he is done he will pass out,and even when
not using their power very much,every few weeks they must rest,so what do you think?

i dunno whether they do or not, but in the mnolg, onewa was making beds, but only 'cos matoran were ill

Well in some places it says they have nightmares, so they must dream...

I am guessing that the Toa and Tohunga both sleep every now and then to regain their energy. Not only does Kopaka talk about his dreams when he lands on Mata-nui, he talks about them after they had defeated Makuta. It went something like, "My dreams have been put at ease for a while, but I sense more evil on the horizon."

I think only the Le-koronans can do without sleep. All they do (under normal circumstances) is party.
But if they didn't sleep, why'd they need huts anyway? It's not like they can't store their posessions in their backpacks, just look at what Takua could stash away in it.
I'd think it'd only be normal for them to sleep. If not to rest, then just for the fun of it.